Abstract: A word processor having an output function for adding margin text, such as a heading or a footing to a main text, includes main text editor, margin text editor, print controller, display device and display device controller. The display controller displays the main text and the margin text simultaneously on the display device in the same form as they are printed out on a paper. Thus, the margin text can be set without printing while an operator confirms its print form.

Abstract: A word processor having attribute functions such as underline, boldface, superscript, etc., can produce or cancel those attribute effects on the display device by simple operations. The word processor with an attribute mode can either produce the attribute effect which is selected by an attribute key in response to the rightward or downward movement of the cursor, or cancel it in response to the leftward or upward movement. The word processor with an attribute cancel mode in addition to an attribute mode can set a mode among a non-attribute mode, an attribute mode and an attribute cancel mode independent of the direction of the cursor's movement.

Abstract: In a document processing apparatus, the top position of the input data visually displayed on a display unit is displaced toward the end of the line and the corresponding control code mark is represented before the top position of the input data when a control code therefor is input. The apparatus is provided with a shift inhibit for adding space codes in the corresponding area of the input data buffer so that format is not changed despite rewrite of the control code, and a shift permit for displacement of the top position after erasure of said control code mark by the erase signal. Thereby, deformatting is prevented and the document processing is easily carried out.